I need a way to make a particular (image)button on a web form fire when the user presses the return key.

Thanks & Regards
Rajni

If your button is submit button that button click will fire when you press return key

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Software professional from Bangalore,INDIA

You can also create an image button WithEvents:
'Declare it
 Protected WithEvents btnInventory As ImageButton

'aspx syntax
<asp:ImageButton ID="btnInventory" BorderWidth="0" ImageUrl="/images/icons/xls.gif" Width="16" Height="16" ImageAlign="AbsMiddle" Runat="server" />

'Then create a sub to handle the event
Sub [subname](ByVal s As Object, ByVal e As ImageClickEventArgs) Handles btnInventory.Click
'Program the action required
End Sub